Imagine for a moment that Earth suddenly shrank to the size of the Moon, while the Moon expanded to the size of Earth. How would life on our planet change? Could humans survive this dramatic cosmic ...

Fifty years ago, on January 2, 1959, Luna 1 started its mission to become the first ever human-made object to exceed the escape velocity of the Earth. The pioneering flight helped to secure ...

Because the force of gravity is stronger at shorter distances, the early Earth-Moon system experienced enormous gravitational tidal forces compared to today’s more distant pairing.

Gravity is a fundamental force of nature; it is an attractive force between any objects that have mass. The strength of gravity between everyday objects, such as a desk and a chair, is extremely ...

In the end, the Chrono simulations revealed several flaws with how VIPER was tested on Earth, as the current testing methods didn’t match the simulations. The flaw included how researchers failed to ...

Have you ever wondered how astronauts seem to defy gravity and float around aboard their spacecrafts? Is it possible to simulate this on earth?

What could happen to change gravity on Earth as we know it? Hillary Shaw Newport, Shropshire, UK There are several ways that surface gravity on Earth could change. We wouldn’t like most of them.

This new propulsion system could rewrite the rules of spaceflight—not to mention completely defy conventional physics.

How can we measure the center of gravity of the Earth? What kinds of measurements do we make, and how detailed can they get?

How does gravity pull things down to Earth? – Gabriel, age four, Stewartby, UK Gravity is a force, which means that it pulls on things. But the Earth isn’t the only thing which has gravity.

In this illustration of Earth seen from the moon, the lunar body tide creates a lump on the moon's surface. (Image credit: NASA's Goddard Space Flight Center) ...